Which tool is used to measure voltage in an aircraft electrical system?

Which tool is used to measure voltage in an aircraft electrical system?

• A. Oscilloscope
• B. Digital Multimeter
• C. Clamp Meter
• D. Megohmmeter

Answer: (B)

Measuring voltage in an aircraft electrical system is best done with a digital multimeter because it directly reads the voltage with high input impedance, so it doesn’t load the circuit. This makes it ideal for checking typical DC bus voltages (and occasional AC measurements when needed) with a clear numeric display and appropriate ranges. It’s the practical tool for routine checks like battery condition, generator output, and supply rails. An oscilloscope can show how voltage changes over time and reveal transients or ripple, but it’s more complex and less convenient for a quick voltage snap in daily maintenance. A clamp meter mainly measures current by clamping around a conductor, and while some models can read voltage, they’re not used for routine voltage measurements. A megohmmeter applies a high voltage to test insulation resistance and isn’t used to read normal operating voltages.

Measuring voltage in an aircraft electrical system is best done with a digital multimeter because it directly reads the voltage with high input impedance, so it doesn’t load the circuit. This makes it ideal for checking typical DC bus voltages (and occasional AC measurements when needed) with a clear numeric display and appropriate ranges. It’s the practical tool for routine checks like battery condition, generator output, and supply rails.

An oscilloscope can show how voltage changes over time and reveal transients or ripple, but it’s more complex and less convenient for a quick voltage snap in daily maintenance. A clamp meter mainly measures current by clamping around a conductor, and while some models can read voltage, they’re not used for routine voltage measurements. A megohmmeter applies a high voltage to test insulation resistance and isn’t used to read normal operating voltages.